File: poisson

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wims 2%3A4.29a%2Bdfsg1-3
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!if $wims_read_parm!=slib_header
  !goto proc
!endif

slib_parms=2\
  1,m\
  1,lambda
slib_author=Sophie, Lemaire; Bernadette, Perrin-Riou

slib_example= 5,2.5
slib_require=octave
!exit

:proc

!distribute item $wims_read_parm into slib_data, slib_lambda

slib_out=$empty
!default slib_m=1
!default slib_lambda=1

!!slib_ex=$[exp(-$slib_lambda)]
!!slib_q=$slib_ex
!!
!!
!!slib_U=!random 0,1 repeat $slib_m
!!
!!!for slib_i=1 to $slib_m
!! slib_V=!item $slib_i of $slib_U
!! slib_q=$slib_ex
!! slib_p=$slib_ex
!! slib_j=0
!!
!!!while $slib_V >= $slib_q
!!  !advance slib_j
!!  slib_p=$[$slib_p*$slib_a/$slib_j]
!!  slib_q=$[$slib_q+$slib_p]
!!!endwhile
!!
!!slib_out=!append item $slib_j to $slib_out
!!!next slib_i


slib_data=!declosing $slib_data
slib_cnt=!itemcnt $slib_data
!if $slib_cnt=1
	slib_data=1,$slib_data
!endif
!!deprecated syntax
!!slib_out=!exec octave poisson_rnd($slib_lambda,$slib_data)
slib_out=!exec octave poissrnd($slib_lambda,$slib_data)

slib_out=!trim $slib_out
slib_out=!replace internal $\
$ by ; in $slib_out
slib_out=!words2items $slib_out